Segmentation faults with 7.0.7-1~dotdeb+8.1

[smelchior]

Hi,

we are getting Segmentation fault (11) using PHP 7.0.7-1~dotdeb+8.1 (cli).

What is your distribution? Debian 8 (8.4 Jessie)
What is your architecture? amd64
Which exact PHP version are you using? 7.0.7-1~dotdeb+8.1
Which SAPI are you using? cli
What’s the full content of your /etc/apt/sources.list and /etc/apt/sources.list.d files?

deb http://ftp.debian.org/debian jessie main non-free contrib
deb http://security.debian.org/ jessie/updates main non-free contrib

deb http://packages.dotdeb.org jessie all
deb-src http://packages.dotdeb.org jessie all

What is the result of dpkg -l 'php*' | grep '^.i' ?

ii  php-common       1:42-1~dotdeb+8.1            all          Common files for PHP packages
ii  php7.0-cli       7.0.7-1~dotdeb+8.1           amd64        command-line interpreter for the PHP scripting language
ii  php7.0-common    7.0.7-1~dotdeb+8.1           all          Common files for packages built from the PHP source
ii  php7.0-dbg       7.0.7-1~dotdeb+8.1           amd64        Debug symbols for PHP7.0
ii  php7.0-igbinary  1.2.1-1~2b7c703-1~dotdeb+8.2 amd64        igbinary serializer for PHP
ii  php7.0-json      7.0.7-1~dotdeb+8.1           amd64        JSON module for PHP
ii  php7.0-memcached 2.2.0-2-52c644b-1~dotdeb+8.2 amd64        memcached extension module for PHP, uses libmemcached
ii  php7.0-msgpack   2.0.1-1~dotdeb+8.2           amd64        MessagePack serializer for PHP
ii  php7.0-opcache   7.0.7-1~dotdeb+8.1           amd64        Zend OpCache module for PHP
ii  php7.0-pgsql     7.0.7-1~dotdeb+8.1           amd64        PostgreSQL module for PHP

Please provide a textual description of the bug (don’t hesitate to provide some code, the expected result…).

reproducible segfaults upon executing a special cli script based on symfony 3

Aug  6 06:43:39 webn4 kernel: php[24173]: segfault at 78 ip 00000000005f223f sp 00007ffd8ba66370 error 4 in php7.0[400000+94f000]
Aug  6 06:44:02 webn4 kernel: php[24186]: segfault at 78 ip 00000000005f223f sp 00007ffdbe76d6a0 error 4 in php7.0[400000+94f000]
Aug  6 06:44:48 webn4 kernel: traps: php[24830] general protection ip:709291 sp:7ffccc4f7108 error:0 in php7.0[400000+94f000]
Aug  6 06:45:44 webn4 kernel: traps: php[24841] general protection ip:709291 sp:7ffcf404fea8 error:0 in php7.0[400000+94f000]

Please provide a backtrace, after installing php5-dbg.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Start Job
Program received signal SIGSEGV, Segmentation fault.
zend_mm_alloc_small (size=56, bin_num=6, heap=0x7ffff5200040) at /usr/src/builddir/Zend/zend_alloc.c:1295
1295    /usr/src/builddir/Zend/zend_alloc.c: No such file or directory.

Any idea what is causing this? The same happens in 7.0.9 but there are no debug symbols available for that version so we downgraded to create this report.

[gplessis]

Could you please try to download and install libpcre3 from this archive (pcre3-8.38.zip)? It contains a backport of libpcre3 from Stretch to Jessie that could potentially solve your issue (see #124). Could you please test it and let me know if it solves your issue?

[smelchior]

I tried, unfortunately the same segfault still happens :(

[mente]

@gplessis is it possible to rebuild latest igbinary? Guess the issue was fixed, check igbinary/igbinary#58

[gplessis]

My latest actions were :

• packaging the latest PHP 7.0 version, with a new php7.0-dbg package
• upload a backport of pcre 8.39
• package the latest php7.0-igbinary version as referenced here

Could you please re-test and let me know if your issue has been fixed? If not, please provide a backtrace.

[gplessis]

Any feedback?

[mig5]

New version of php-igbinary might've introduced other problems? See #152

[smelchior]

sorry for the late reply, for me the issue is fixed, i cannot currently reproduce it

[prebenlm]

Did you do anything specific to resolve it @smelchior ? Because I experience an segmentation fault in a cli script as well, with PHP 7.1.

[smelchior]

With the version with the pcre backport, it worked. We switched to the https://deb.sury.org/ packages for 7.1 by now.